Yanquetino
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Safety HV Disconnect?

Thu Jun 03, 2010 10:48 am

I know that the RAV4-EV has a high voltage disconnect behind the driver's rear seat:

Image

The Mini-E also has one in the cargo area on the left side:

Image

I believe that the EV1 likewise had such a switch, but I am not sure where it was located.

My question is: will the Leaf have one? If so, where will it be located?

It seems to me that it is an essential safety feature for emergency personnel who arrive on the scene of a serious accident involving an EV.

AndyH
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Re: Safety HV Disconnect?

Thu Jun 03, 2010 4:40 pm

The EV1 disconnect is behind the passenger seat back. Pictures 13-15 here.

There appears to be a plug on the top of the Leaf pack roughly under the rear foot well tunnel area. That's my guess for the traction pack disconnect.

Image

Image

edit: Washington Post image disappeared. Found sheet-metal cut-out image from Nissan.
Last edited by AndyH on Tue Jun 15, 2010 12:32 pm, edited 1 time in total.

Yanquetino
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Re: Safety HV Disconnect?

Thu Jun 03, 2010 6:06 pm

AndyH wrote:There appears to be a plug on the top of the Leaf pack roughly under the rear foot well tunnel area. That's my guess for the traction pack disconnect.

AndyH: I think you're right! That sure looks similar to the RAV4-EV's disconnect plug.

We can also see it in this cutaway photo, with its plastic housing above the battery cover:

Image

Now I wonder how to access that plug. Would you have to pull the carpet off the rear tunnel in back?

Image

My guess is that it might actually be accessible from the very bottom and rear of the armrest storage bin:

Image

At least it's good to know that there IS a way to disable the traction battery entirely.
Last edited by Yanquetino on Thu Jun 03, 2010 7:50 pm, edited 1 time in total.

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Re: Safety HV Disconnect?

Thu Jun 03, 2010 6:39 pm

Shouldn't it be accessible to emergency personnel located closer to the "exterior" of a (smashed) car ? (Notice how in some accidents the occupants need to be "cut out" ... how do you get in there and pull the switch ?) Wouldn't a better location be under the hood or trunk -- which, if heavily damaged, is often "popped up" ?
Is this "disconnect" the same as or related to the SRS disable that emergency personnel needs to get to ?
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Re: Safety HV Disconnect?

Fri Jun 04, 2010 5:50 am

I wondered about some sort of mechanical cable system to a couple different places to pull the disconnect. So if one part of the vehicle was damaged or inaccessible after an accident you could access a cable pull from another place.
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garygid
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Re: Safety HV Disconnect?

Sat Jun 05, 2010 7:31 am

At the front, the two big red connectors would be the battery pack's Plus and Minus, which would be about 350 volts DC, designed to carry something like 250 amps (85 kW capable).

The little white connector would be pack-status communication?
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Yanquetino
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Re: Safety HV Disconnect?

Sat Jun 05, 2010 8:18 am

garygid wrote:At the front, the two big red connectors would be the battery pack's Plus and Minus, which would be about 350 volts DC, designed to carry something like 250 amps (85 kW capable).

Since the front seats are positioned on top of the front battery modules, those two big red connectors appear to be in a fairly inaccessible location underneath the shifter "mouse" in the center console. My guess is that they are the prime connection between the battery pack and the controller/chargers...?

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Re: Safety HV Disconnect?

Sat Jun 05, 2010 1:48 pm

Yes, they are certainly representing "the" motive power connection.

The "Production" connections might be different, to better support pack service, swapping, or replacement.

There might be a seperate 12v power into the battery pack, to power the pack's internal electronics.
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Re: Safety HV Disconnect?

Tue Jun 15, 2010 7:52 am

This bring up another question. Take the recent media hype about runaway Toyota vehicles with their gas pedal issues or whatever. Well, first of all, I thought that was mostly retarded because anyone who doesn't know about putting a car into neutral or turning it off doesn't need to be behind the wheel of a car.

However - this is something we should seriously think about with the Leaf. As far as I know, it has no transmission to put into neutral, right? I've also always been told that with do-it-yourself electric cars there is always a small change the motor controller could fail, and fail in a way that was supplying constant power to the motor without being able to shut it off. Although the battery pack is generally connected via a relay which is controlled by the key-switch, there is a possibility that if the current is high enough the relay may not be able to disconnect.

So Nissan needs to be sure to provide us with the means, and the education to be able to stop the Leaf in the event of a stuck throttle or motor controller.
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LTLFTcomposite
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Re: Safety HV Disconnect?

Tue Jun 15, 2010 8:00 am

adric22 wrote:This bring up another question. Take the recent media hype about runaway Toyota vehicles with their gas pedal issues or whatever. Well, first of all, I thought that was mostly retarded because anyone who doesn't know about putting a car into neutral or turning it off doesn't need to be behind the wheel of a car.

However - this is something we should seriously think about with the Leaf. As far as I know, it has no transmission to put into neutral, right? I've also always been told that with do-it-yourself electric cars there is always a small change the motor controller could fail, and fail in a way that was supplying constant power to the motor without being able to shut it off. Although the battery pack is generally connected via a relay which is controlled by the key-switch, there is a possibility that if the current is high enough the relay may not be able to disconnect.

So Nissan needs to be sure to provide us with the means, and the education to be able to stop the Leaf in the event of a stuck throttle or motor controller.


Yeah... and it should be a mechanical hard disconnect, not some stupid thing through a touch screen interface on a computer connected to a bunch of sensors and actuators with hundreds of points of failure.
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